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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to have a spare key on hand no matter if you've dropped your keyfob or it was unable to function. This article will explain how to add, change, and reprogramme your Mazda 3 keyfobs. A word of caution Some keys require programming by a professional locksmith or dealer, while other keys don't. Make sure you only use genuine Mazda replacements for your key fob. How do you add an additional key If you're unable to find a spare key from the dealership when you purchase your Mazda 3 or accidentally break the one you have Don't fret, there's still an option to make another key. You'll need to use a flathead screwdriver, and an CR2025 battery. Once mazda demio key got these tools then it's time to remove the key fob and replace the battery. Find the key release auxiliary. It's located underneath the metal part and is easy to find. Once you hit the button, the cover should slide off immediately. Then, you can insert the screwdriver's head into the notch, or the spacing at the top of the metal part and pry it off. Insert your new or spare key into the slot after you have removed the auxiliary key. Set the ignition to ON and wait for five seconds before setting it to OFF. This will register the new information on the key to the system that will allow it to start your vehicle in the future. It's important to know that you can only program up to three keys for your Mazda 3. You don't want to utilize more than two key fobs in order to start your car. This is a safety measure to stop unauthorized users from activating your key fobs and starting your vehicle. How to Reprogram a spare key If you have a spare key it's a good idea be aware of how to reprogram it in the event that your original key gets lost or stolen. This will stop unauthorised people from stealing your car and starting it. This should work with any Mazda. You will need two keys that work to begin the reprogramming. If you don't have two functioning keys, you'll have to take your vehicle to a dealer to get it done. Begin by putting yourself in the driver's seat and close the door, with the exception for the one that's already opened. Put the first working key in the slot, and then set the ignition to ON. For five seconds, remove the key and repeat with the second working key. Once you've programmed your new key, you should have three working keys you can use to start your car in the future. Test each key to ensure sure that they're working properly before placing them away. It's a good idea purchase a spare Mazda 3 key fob, especially if you're someone who is prone to losing keys or has other issues with it. You can purchase one online or at your local automotive store, but make sure to read reviews prior to purchasing so you aren't purchasing an item that isn't compatible with your vehicle. How do you change the battery using a spare key There's nothing more frustrating than finding that the battery for your key fob has died and you can't unlock your vehicle. Fortunately, it's easy to replace the battery and save yourself some cash at the dealership. Press the auxiliary button on the back of the keyfob. This will remove the key from the metal and reveal a slot on each side of the case. Put the flathead into one of these slots and then gently pry the two halves of the case apart. Once the battery is fully exposed, take it out and put it away somewhere you won't forget it. Before you begin, be sure that you have a brand new replacement battery. You can find these at any store that sells batteries or at an Mazda dealer near Winter Garden. The correct type of battery is essential to ensure that your keyfob works properly. Then, put the new battery in its place and then replace the battery cap. Be careful not to scratch the small rubber ring the battery rests on. Press the two halves together until you can hear the click. How to reset the system's Keyless Entry System The key fob in your Mazda 3 is not only an extra convenience, but also an important security feature. If you lost your key or had it stolen the car won't start even if you've got the spare key fob. The key fob must be reset by the dealer to make it work again. This can be an expensive and time-consuming process It's a good idea to know how to reset the system yourself. Remove the battery from the system for 15 minutes. This will remove any residual electrical current from the computer on board. Then, disconnect the LF-ECU and demand switch connectors. Verify the continuity between the next terminals. To program the new key or spare, insert it into the slot and turn the ignition to ON. Leave the key in for around five seconds, and then switch it off. The key's information is transferred to the computer of your vehicle and the new fob is able to start your car. You can program as many fobs you want however only one must be used at a particular time. This will prevent unauthorised people from stealing your keys and gaining access to your car. You can purchase a replacement key fob online, however you'll need to visit an expert locksmith or dealer to cut it and get it programmed.